#include <errno.h>
#include <string.h>
#include <sys/ioctl.h>
+#include <linux/if_arp.h>
#include <linux/if_infiniband.h>
#include "sd-dhcp6-client.h"
#include "dhcp6-lease-internal.h"
#include "dhcp6-protocol.h"
#include "dns-domain.h"
+#include "event-util.h"
#include "fd-util.h"
#include "hostname-util.h"
#include "in-addr-util.h"
#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN
+#define IRT_DEFAULT 1 * USEC_PER_DAY
+#define IRT_MINIMUM 600 * USEC_PER_SEC
+
/* what to request from the server, addresses (IA_NA) and/or prefixes (IA_PD) */
enum {
DHCP6_REQUEST_IA_NA = 1,
struct sd_dhcp6_lease *lease;
int fd;
bool information_request;
+ bool iaid_set;
be16_t *req_opts;
size_t req_opts_allocated;
size_t req_opts_len;
void *userdata;
struct duid duid;
size_t duid_len;
+ usec_t information_request_time_usec;
+ usec_t information_refresh_time_usec;
};
static const uint16_t default_req_opts[] = {
assert_return(IN_SET(client->state, DHCP6_STATE_STOPPED), -EBUSY);
if (duid != NULL) {
- r = dhcp_validate_duid_len(duid_type, duid_len);
- if (r < 0)
- return r;
+ r = dhcp_validate_duid_len(duid_type, duid_len, true);
+ if (r < 0) {
+ r = dhcp_validate_duid_len(duid_type, duid_len, false);
+ if (r < 0)
+ return r;
+ log_dhcp6_client(client, "Setting DUID of type %u with unexpected content", duid_type);
+ }
client->duid.type = htobe16(duid_type);
memcpy(&client->duid.raw.data, duid, duid_len);
client->ia_na.ia_na.id = htobe32(iaid);
client->ia_pd.ia_pd.id = htobe32(iaid);
+ client->iaid_set = true;
return 0;
}
return 0;
}
-int sd_dhcp6_client_set_transaction_id(sd_dhcp6_client *client, be32_t transaction_id) {
+int sd_dhcp6_client_set_transaction_id(sd_dhcp6_client *client, uint32_t transaction_id) {
assert_return(client, -EINVAL);
client->transaction_id = transaction_id;
client->retransmit_time = 0;
client->retransmit_count = 0;
- client->timeout_resend = sd_event_source_unref(client->timeout_resend);
- client->timeout_resend_expire =
- sd_event_source_unref(client->timeout_resend_expire);
- client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
- client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
+ (void) event_source_disable(client->timeout_resend);
+ (void) event_source_disable(client->timeout_resend_expire);
+ (void) event_source_disable(client->timeout_t1);
+ (void) event_source_disable(client->timeout_t2);
client->state = DHCP6_STATE_STOPPED;
assert(client);
assert(client->lease);
- client->timeout_t2 =
- sd_event_source_unref(client->timeout_t2);
+ (void) event_source_disable(client->timeout_t2);
log_dhcp6_client(client, "Timeout T2");
assert(client);
assert(client->lease);
- client->timeout_t1 =
- sd_event_source_unref(client->timeout_t1);
+ (void) event_source_disable(client->timeout_t1);
log_dhcp6_client(client, "Timeout T1");
assert(client);
assert(client->event);
- client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+ (void) event_source_disable(client->timeout_resend);
switch (client->state) {
case DHCP6_STATE_INFORMATION_REQUEST:
init_retransmit_time = DHCP6_REB_TIMEOUT;
max_retransmit_time = DHCP6_REB_MAX_RT;
- if (!client->timeout_resend_expire) {
+ if (event_source_is_enabled(client->timeout_resend_expire) <= 0) {
r = dhcp6_lease_ia_rebind_expire(&client->lease->ia,
&expire);
if (r < 0) {
log_dhcp6_client(client, "Next retransmission in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX, client->retransmit_time, USEC_PER_SEC));
- r = sd_event_add_time(client->event, &client->timeout_resend,
- clock_boottime_or_monotonic(),
- time_now + client->retransmit_time,
- 10 * USEC_PER_MSEC, client_timeout_resend,
- client);
+ r = event_reset_time(client->event, &client->timeout_resend,
+ clock_boottime_or_monotonic(),
+ time_now + client->retransmit_time, 10 * USEC_PER_MSEC,
+ client_timeout_resend, client,
+ client->event_priority, "dhcp6-resend-timer", true);
if (r < 0)
goto error;
- r = sd_event_source_set_priority(client->timeout_resend,
- client->event_priority);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer");
- if (r < 0)
- goto error;
-
- if (max_retransmit_duration && !client->timeout_resend_expire) {
+ if (max_retransmit_duration && event_source_is_enabled(client->timeout_resend_expire) <= 0) {
log_dhcp6_client(client, "Max retransmission duration %"PRIu64" secs",
max_retransmit_duration / USEC_PER_SEC);
- r = sd_event_add_time(client->event,
- &client->timeout_resend_expire,
- clock_boottime_or_monotonic(),
- time_now + max_retransmit_duration,
- USEC_PER_SEC,
- client_timeout_resend_expire, client);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_priority(client->timeout_resend_expire,
- client->event_priority);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer");
+ r = event_reset_time(client->event, &client->timeout_resend_expire,
+ clock_boottime_or_monotonic(),
+ time_now + max_retransmit_duration, USEC_PER_SEC,
+ client_timeout_resend_expire, client,
+ client->event_priority, "dhcp6-resend-expire-timer", true);
if (r < 0)
goto error;
}
static int client_ensure_iaid(sd_dhcp6_client *client) {
int r;
- be32_t iaid;
+ uint32_t iaid;
assert(client);
- if (client->ia_na.ia_na.id)
+ if (client->iaid_set)
return 0;
- r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, &iaid);
+ r = dhcp_identifier_set_iaid(client->ifindex, client->mac_addr, client->mac_addr_len, true, &iaid);
if (r < 0)
return r;
client->ia_na.ia_na.id = iaid;
client->ia_pd.ia_pd.id = iaid;
+ client->iaid_set = true;
return 0;
}
DHCP6Message *message,
size_t len,
sd_dhcp6_lease *lease) {
+
+ uint32_t lt_t1 = ~0, lt_t2 = ~0;
+ bool clientid = false;
size_t pos = 0;
+ usec_t irt = IRT_DEFAULT;
int r;
- bool clientid = false;
- uint32_t lt_t1 = ~0, lt_t2 = ~0;
assert(client);
assert(message);
len -= sizeof(DHCP6Message);
while (pos < len) {
- DHCP6Option *option = (DHCP6Option *)&message->options[pos];
+ DHCP6Option *option = (DHCP6Option *) &message->options[pos];
uint16_t optcode, optlen;
- int status;
- uint8_t *optval;
be32_t iaid_lease;
+ uint8_t *optval;
+ int status;
- if (len < pos + offsetof(DHCP6Option, data) ||
- len < pos + offsetof(DHCP6Option, data) + be16toh(option->len))
+ if (len < pos + offsetof(DHCP6Option, data))
return -ENOBUFS;
optcode = be16toh(option->code);
optlen = be16toh(option->len);
optval = option->data;
+ if (len < pos + offsetof(DHCP6Option, data) + optlen)
+ return -ENOBUFS;
+
switch (optcode) {
case SD_DHCP6_OPTION_CLIENTID:
if (clientid) {
break;
case SD_DHCP6_OPTION_STATUS_CODE:
- status = dhcp6_option_parse_status(option, optlen);
- if (status) {
+ status = dhcp6_option_parse_status(option, optlen + sizeof(DHCP6Option));
+ if (status < 0)
+ return status;
+
+ if (status > 0) {
log_dhcp6_client(client, "%s Status %s",
dhcp6_message_type_to_string(message->type),
dhcp6_message_status_to_string(status));
- dhcp6_lease_free_ia(&lease->ia);
- dhcp6_lease_free_ia(&lease->pd);
return -EINVAL;
}
return r;
break;
+
+ case SD_DHCP6_OPTION_INFORMATION_REFRESH_TIME:
+ irt = be32toh(*(be32_t *) optval) * USEC_PER_SEC;
+ break;
}
pos += offsetof(DHCP6Option, data) + optlen;
}
}
+ client->information_refresh_time_usec = MAX(irt, IRT_MINIMUM);
+
return 0;
}
assert(client->event);
buflen = next_datagram_size_fd(fd);
+ if (buflen == -ENETDOWN) {
+ /* the link is down. Don't return an error or the I/O event
+ source will be disconnected and we won't be able to receive
+ packets again when the link comes back. */
+ return 0;
+ }
if (buflen < 0)
return buflen;
len = recv(fd, message, buflen, 0);
if (len < 0) {
- if (IN_SET(errno, EAGAIN, EINTR))
+ /* see comment above for why we shouldn't error out on ENETDOWN. */
+ if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN))
return 0;
return log_dhcp6_client_errno(client, errno, "Could not receive message from UDP socket: %m");
assert_return(client->ifindex > 0, -EINVAL);
assert_return(client->state != state, -EINVAL);
- client->timeout_resend_expire =
- sd_event_source_unref(client->timeout_resend_expire);
- client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+ (void) event_source_disable(client->timeout_resend_expire);
+ (void) event_source_disable(client->timeout_resend);
client->retransmit_time = 0;
client->retransmit_count = 0;
log_dhcp6_client(client, "T1 expires in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC));
- r = sd_event_add_time(client->event,
- &client->timeout_t1,
- clock_boottime_or_monotonic(), time_now + timeout,
- 10 * USEC_PER_SEC, client_timeout_t1,
- client);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_priority(client->timeout_t1,
- client->event_priority);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_description(client->timeout_t1, "dhcp6-t1-timeout");
+ r = event_reset_time(client->event, &client->timeout_t1,
+ clock_boottime_or_monotonic(),
+ time_now + timeout, 10 * USEC_PER_SEC,
+ client_timeout_t1, client,
+ client->event_priority, "dhcp6-t1-timeout", true);
if (r < 0)
goto error;
log_dhcp6_client(client, "T2 expires in %s",
format_timespan(time_string, FORMAT_TIMESPAN_MAX, timeout, USEC_PER_SEC));
- r = sd_event_add_time(client->event,
- &client->timeout_t2,
- clock_boottime_or_monotonic(), time_now + timeout,
- 10 * USEC_PER_SEC, client_timeout_t2,
- client);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_priority(client->timeout_t2,
- client->event_priority);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_description(client->timeout_t2, "dhcp6-t2-timeout");
+ r = event_reset_time(client->event, &client->timeout_t2,
+ clock_boottime_or_monotonic(),
+ time_now + timeout, 10 * USEC_PER_SEC,
+ client_timeout_t2, client,
+ client->event_priority, "dhcp6-t2-timeout", true);
if (r < 0)
goto error;
client->transaction_id = random_u32() & htobe32(0x00ffffff);
client->transaction_start = time_now;
- r = sd_event_add_time(client->event, &client->timeout_resend,
- clock_boottime_or_monotonic(), 0, 0, client_timeout_resend,
- client);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_priority(client->timeout_resend,
- client->event_priority);
- if (r < 0)
- goto error;
-
- r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout");
+ r = event_reset_time(client->event, &client->timeout_resend,
+ clock_boottime_or_monotonic(),
+ 0, 0,
+ client_timeout_resend, client,
+ client->event_priority, "dhcp6-resend-timeout", true);
if (r < 0)
goto error;
client->fd = r;
}
- if (client->information_request)
+ if (client->information_request) {
+ usec_t t = now(CLOCK_MONOTONIC);
+
+ if (t < usec_add(client->information_request_time_usec, client->information_refresh_time_usec))
+ return 0;
+
+ client->information_request_time_usec = t;
state = DHCP6_STATE_INFORMATION_REQUEST;
+ }
log_dhcp6_client(client, "Started in %s mode",
client->information_request? "Information request":
static sd_dhcp6_client *dhcp6_client_free(sd_dhcp6_client *client) {
assert(client);
+ client->timeout_resend = sd_event_source_unref(client->timeout_resend);
+ client->timeout_resend_expire = sd_event_source_unref(client->timeout_resend_expire);
+ client->timeout_t1 = sd_event_source_unref(client->timeout_t1);
+ client->timeout_t2 = sd_event_source_unref(client->timeout_t2);
+
client_reset(client);
client->fd = safe_close(client->fd);
int sd_dhcp6_client_new(sd_dhcp6_client **ret) {
_cleanup_(sd_dhcp6_client_unrefp) sd_dhcp6_client *client = NULL;
+ _cleanup_free_ be16_t *req_opts = NULL;
size_t t;
assert_return(ret, -EINVAL);
- client = new0(sd_dhcp6_client, 1);
- if (!client)
+ req_opts = new(be16_t, ELEMENTSOF(default_req_opts));
+ if (!req_opts)
return -ENOMEM;
- client->n_ref = 1;
- client->ia_na.type = SD_DHCP6_OPTION_IA_NA;
- client->ia_pd.type = SD_DHCP6_OPTION_IA_PD;
- client->ifindex = -1;
- client->request = DHCP6_REQUEST_IA_NA;
- client->fd = -1;
+ for (t = 0; t < ELEMENTSOF(default_req_opts); t++)
+ req_opts[t] = htobe16(default_req_opts[t]);
- client->req_opts_len = ELEMENTSOF(default_req_opts);
- client->req_opts = new0(be16_t, client->req_opts_len);
- if (!client->req_opts)
+ client = new(sd_dhcp6_client, 1);
+ if (!client)
return -ENOMEM;
- for (t = 0; t < client->req_opts_len; t++)
- client->req_opts[t] = htobe16(default_req_opts[t]);
+ *client = (sd_dhcp6_client) {
+ .n_ref = 1,
+ .ia_na.type = SD_DHCP6_OPTION_IA_NA,
+ .ia_pd.type = SD_DHCP6_OPTION_IA_PD,
+ .ifindex = -1,
+ .request = DHCP6_REQUEST_IA_NA,
+ .fd = -1,
+ .req_opts_len = ELEMENTSOF(default_req_opts),
+ .req_opts = TAKE_PTR(req_opts),
+ };
*ret = TAKE_PTR(client);
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